``(F) A semiautomatic pistol that has the ability
to accept a detachable magazine, and has--
``(i) a second pistol grip,
``(ii) a threaded barrel,
``(iii) a barrel shroud, or
``(iv) the capacity to accept a detachable
magazine at a location outside of the pistol
grip.

So, I could rig a forward grip on an old police trade Glock? And get enough of a refund to buy two more Glocks with my tax refund the first year, and two more Glocks the next year?